[waimea] windows' corner color

[Pedro Venda]

hi everyone.

i found out something which may or may not be a bug;

i tried waimea on two computers, in a vain attempt to use it with gnome. 
what i found out was that on one of them, the color of the windows' 
corners remains the color that was on the background when the window was 
first created. let me explain it further: as you all know, the waimea 
windows' corners are round and there is a small area there that should 
be transparent.

on the other computer, it is ok. the corners are really transparent. 
both computers run xorg.

thanks in advance.

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